69 results about "Magnetic axis" patented technology

A method of attaching a magnetic element to a needle assembly. The needle assembly can include a cannula extending along a longitudinal axis. The method can include placing the magnetic element in a magnetic field such that a magnetic axis of the magnetic element substantially aligns with the magnetic field. The method can further include securing the magnetic element to a portion of the needle assembly while the magnetic element is substantially aligned with the magnetic field such that the magnetic axis of the magnetic element is secured in a desired predetermined orientation.

The invention relates to the technical field of hemostasis, and discloses a hemostasis device which comprises a tourniquet, a device bin is installed on the tourniquet, a winding shaft is installed in the device bin, two elastic belts are installed on the winding shaft, the ends of the two elastic belts are fixedly connected with the inner walls of the two ends of the tourniquet respectively, and a guide cylinder is fixedly installed on the winding shaft. According to the hemostasis device, the mechanical timing device is used for driving the rotating cylinder to wind the elastic rope, the first magnetic ring is attracted by the magnetic force of the second magnetic ring to drive one end of the elastic rope to move upwards in the rotary knob, and when the rotating shaft and the rotating cylinder are not reset completely, the elastic rope is pulled, so that the elastic rope is wound, and the hemostasis effect is achieved. When the elastic rope is stretched to a certain degree, the pulling force borne by the first magnetic ring is larger than the magnetic attraction force exerted on the first magnetic ring by the second magnetic ring, the first magnetic ring is downwards aligned with the magnetic shaft, the magnetic shaft retracts into the rotary knob, the rotary knob moves upwards to reset, the elastic belt is not rolled any more, and the relaxation time of the tourniquet is effectively adjusted according to the limb bleeding degree of a patient.

The utility model discloses a center grounding type magnetic shaft key, and relates to the field of input equipment, the center grounding type magnetic shaft key comprises a body, a pressing handle movably mounted in the body in a resettable manner, a magnetic column arranged in the pressing handle, and a Hall sensing device located on one side of the bottom surface of the body and matched with the magnetic column in an aligned manner, the bottom end of the pressing handle is a sealed solid bottom and matched with the bottom of the body, and the magnetic column is arranged in the Hall sensing device. When the key works, the bottom end of the pressing handle is contacted and collided with the bottom of the body to provide key feedback sound; the pressing handle is composed of a main part located on the upper portion and a detachable part located on the lower portion, at least the detachable part is a non-magnetic plastic part, and the main part and the detachable part are connected in an inserted mode in the axial direction. The lower end of the detachable part is a solid bottom, and the top end of the detachable part is downwards provided with a mounting groove; and the magnetic column is inserted from the top end of the key body and is fixed in the mounting groove. According to the key, the magnetic column is mounted from the upper part of the pressing handle, so that the lower end of the pressing handle is sealed as a solid bottom, the sound is clearer and more concentrated during key operation, the produced sound is better, and the use experience of a user is remarkably improved.

The invention discloses a half-open type thrust magnetic levitation bearing. The bearing comprises a first magnetic ring, a second magnetic ring and a third magnetic ring, wherein the first magnetic ring, the second magnetic ring and the third magnetic ring are arranged in annular and laminating manners so as to form an annular magnetic pole; the magnetic pole of each of the magnetic rings is different from that of the adjacent magnetic ring; a first winding and a second winding of the annular magnetic pole are wound according to a predetermined half-open way, the lower part of the middle magnetic pole is recessed inwards so as to generate a winding space which meets predetermined conditions; and the magnetic pole arranged at the upper end extends, and thus, a complete circle of magnetic pole is formed after splicing. Based on the bearing, continuity and consistency of magnetic field strength of the magnetic poles of the half-opened axial thrust bearing can be basically reserved, and the half-open type thrust magnetic levitation bearing can be applied to high-speed rotation machines; and moreover, a more flexible mounting way can be obtained, particularly to large-size rotation machines.

The invention provides a Hall circuit and a Hall chip, which are applied to the technical field of electromagnetic signals. According to the invention, the switch module can be in a continuous opening state, so that the magnetic induction intensity of a surrounding magnetic field can be detected and the working state of the linear Hall sensor can be controlled in real time; as the switch module only needs to realize the functions of detecting the magnetic induction intensity of the surrounding magnetic field in real time and starting the linear Hall sensor switch, the resistance value of the magnetoresistive sensor of the switch module can be set to be large, and the purpose of reducing the quiescent current and power consumption of the Hall circuit can be achieved; secondly, the linear Hall sensor can be used for carrying out high-precision detection on the key stroke of the magnetic axis keyboard, so that the resistance value of a Hall element of the linear Hall sensor can be set to be small, and the detection precision of the linear Hall sensor meets the requirement; moreover, seamless linkage between the press stroke of the key and the brightness of the load LED lamp can be realized by using the load driving module, so that the user experience is enhanced, and software intervention is not needed.

The present disclosure relates to systems and methods of transmitting wireless vehicle power to vehicle devices with offset sensors. A vehicle includes one or more low-load devices and a plurality of magnetic sensors operable between an offset detection mode for measuring a magnetic field of a power transmitting pad and obtaining magnetic field data and a power reception mode for wirelessly transmitting energy from the power transmitting pad to the one or more low-load devices. The vehicle further includes one or more processors and one or more memory modules including a computer-readable medium storing computer-readable instructions that, when executed by the one or more processors, cause the one or more processors to receive the magnetic field data from the plurality of magnetic sensors and estimate a lateral offset of the plurality of magnetic sensors relative to a magnetic axis of the power transmitting pad.

The invention relates to a magnetic axial device for use as a motor or generator for generating electrical energy. The magnetic axial device (1) comprises: at least one stator (3) mounted on the shaft (2) and having a magnetic component (7), at least a portion of which rests on a limited peripheral annular section of at least one of the disc-shaped end faces (5) of the at least one stator, the limited peripheral annular section being a desired area (6) of the disc-shaped end face (5) of the stator (3); at least one disc rotor (4) mounted on the shaft (2) and having a magnetic component (8) and capable of axial rotation and interacting with the stator (3), at least a portion of its magnetic component (8) being placed on a limited peripheral annular section, the limited peripheral annular section is a desired area (10) of a side face (9) of the disc rotor (4) facing the disc end face (5) of the stator (3) with the magnetic component (7). At the same time, the surfaces of the interacting magnetic components (7, 8) of the stator (3) and rotor (4) have a compatible volumetric shape.

This invention relates to the technical field of computer input devices, and more particularly to a high-performance magnetic axis keyboard. The key features of this technical solution are: a keyboard body, a magnetic axis, and keycaps. The magnetic axis includes: a housing connected to the keyboard body; a core, vertically mounted within the key axis, the core having a magnet; a Hall effect sensor located in the housing and engaging with the magnet; a floating element vertically mounted in the housing; a spring connected to both the core and the floating element; and an adjusting element located in the housing and connected to the floating element. The adjusting element drives the floating element to adjust its position, thereby controlling the initial compression of the spring. This application enables the adjustment of the magnetic axis keyboard's actuation force, thus solving the problems of limited actuation force and monotonous tactile feedback in magnetic axis keyboards.

The utility model belongs to the technical field of variable strong magnetic fields. The utility model provides a variable strong magnetic field generating device which comprises a pure iron shell cone, a pole magnet assembly, a conical neodymium iron boron permanent magnet, an aluminum rear isolation plate, a feeding pure iron magnetic conduction shaft, a pure iron magnetic conduction shaft support and a magnetic conduction shaft feeding mechanism. A conical neodymium iron boron permanent magnet, a magnetic pole magnet assembly, an aluminum rear isolation plate and a pure iron magnetic conductive shaft bracket are sequentially arranged from the head part to the tail part of the pure iron shell cone; the pole magnet assembly is fixed on the cylinder part in the pure iron shell cone; the pole magnet assembly is cylindrical and sequentially comprises a pure copper magnetic pole wrapping shell, a fan-shaped neodymium iron boron permanent magnet arranged in a pure copper magnetic pole isolation frame and a magnetic conduction shaft feeding channel from outside to inside. Local conduction of the permanent magnet is accurately adjusted, and the surface magnetic line density of the surface of the sample is changed, so that the effect of changing the magnetic field intensity is achieved. Magnetic circuits of the magnetic conduction shaft adjusting mechanism are sequentially communicated, and the purpose of finely adjusting the magnetic field intensity is achieved.

The invention belongs to the technical field of magnetic measurement testing, and particularly relates to a magnetic moment coil calibration device and method, which can realize that a magnetic moment coil keeps still in the calibration process, realizes the change of magnetic flux through the change of current, and then calculates the magnetic moment through the variable quantity of the magnetic flux. In the invention, the relative position between the calibrated magnetic moment coil and the standard constant magnetic field coil as the magnetic flux induction coil is always kept fixed in the calibration process, so that the problem that the magnetic axis is difficult to align accurately due to physical movement in the traditional drawing method or overturning method is thoroughly avoided; therefore, the reference alignment precision and reliability of calibration are improved. Magnetic moment coils with different sizes can be matched through the magnetic flux induction coils with different uniform area sizes, and the problem that the pulling or overturning operability of large magnetic moment coils is poor can be avoided.

The utility model relates to the technical field of magnetic shaft keys, in particular to a magnetic shaft key switch with a double-light-guide structure, which comprises a shell and a shaft core structure arranged in the shell in a lifting manner, a spring used for supporting the shaft core structure is arranged in the shell, the shaft core structure comprises a magnet, and the magnet is arranged in the shell. Light guide pieces penetrating through the shell are arranged on the two sides of the shaft core structure. According to the keyboard, the light guide pieces are arranged on the two sides of the keys in the penetrating mode, it is ensured that the key switches and the key caps on the key switches can be fully covered by lamplight, the uniformity and coordination of the lamplight are greatly improved, the lamplight effect of the keyboard is improved, and the use experience of a user is improved. Compared with a traditional single-side light guide structure, the double-light-guide-column structure remarkably enlarges the illumination range of the key, so that light is more uniform and harmonious.

This invention provides a testing device and method for permanent magnet synchronous linear motors, relating to the field of magnetic variable measurement technology. The device includes a housing with a detection mechanism inside. The detection mechanism comprises a first rotating rod and a rotating disk. A rotating plate and a push rod are fixedly connected to the outer surface of the first rotating rod. A locking block is fixedly connected to the outer surface of the rotating plate. A locking groove is formed on the outer surface of the rotating disk. The locking block is slidably connected to the locking groove. This invention's unique multi-angle rotation design allows for multi-dimensional magnetic field data acquisition from irregularly shaped rotors. Analysis of the data allows for precise positioning of the magnetic shaft, ensuring high accuracy and strong adaptability in testing. Furthermore, the automated operation through mechanical linkage significantly improves testing efficiency, realizing the advantage of integrating multi-dimensional detection functions into a single device. This effectively reduces equipment investment and operational complexity, and has significant practical value for performance testing of permanent magnet synchronous linear motors, especially those with irregularly shaped rotors.

The present application relates to the field of input devices, and discloses a key having a magnetic switch. The key having a magnetic switch comprises a base body, a key body, a magnetic block, and a Hall sensor. The base body is hollow to form a mounting position, and the key body is mounted in the mounting position. The magnetic block is provided in the mounting position opposite to the Hall sensor. Magnetic poles of the magnetic block are arranged in the vertical direction to form a magnetic field distribution in the vertical direction. The magnetic block and the key body move synchronously in the vertical direction. When the magnetic block is at an initial position, a lower magnetic pole of the magnetic block horizontally and oppositely cooperates with the Hall sensor, and when the magnetic block moves to a lower stroke stop point, an upper magnetic pole of the magnetic block horizontally and oppositely cooperates with the Hall sensor. According to the key, the Hall sensor is triggered by means of changes in the magnetic poles, so that changes in the magnetic field can be controlled more accurately, thereby ensuring the accuracy and interference resistance of a trigger signal, and reducing the possibility of false triggering and missed triggering.

The application discloses a kind of three-dimensional magnetic field coil magnetic axis orthogonality measurement methods under geomagnetic field environment, belong to magnetometry technical field.The method does not need to construct zero magnetic environment, only utilizes scalar magnetometer and unipolar current source, through the measurement geomagnetic field scalar, single-axis different current under the synthetic magnetic field, the synthetic magnetic field of double-axis simultaneous energization, combine spatial vector mathematical model and equation set elimination method, eliminate the unknown angle interference of geomagnetic field and coil magnetic field, sequentially solve single-axis magnetic field intensity, three-axis magnetic axis angle, finally obtain magnetic axis orthogonality.The application measurement equipment is less, easy to operate, time-consuming is short, uncertainty is small, measurement precision is high, can be widely applied in magnetometry, aerospace, biological medical fields such as three-dimensional magnetic field coil orthogonality verification, calibration and test.

The application relates to a long-service-life anti-nuclear-radiation dustproof magnetic liquid sealing device, and belongs to the technical field of mechanical engineering sealing. The device comprises a shell assembly, a threaded end cover, a clamping hoop assembly, a magnetic guide sleeve assembly, magnetic liquid, four permanent magnets, four magnetic shielding rings, a right bearing, a right pole shoe assembly, a middle pole shoe assembly, a left pole shoe assembly, a left bearing and a syringe. The magnetic liquid is injected between the permanent magnet I, the permanent magnet IV and the shell to form a magnetic liquid static seal, and the magnetic liquid is injected between the permanent magnet I and the permanent magnet IV and the magnetic guide sleeve to form a magnetic liquid dynamic seal, so that the right bearing and the left bearing are prevented from being blocked due to the entry of radioactive powder, and the stable operation of the device is ensured; when the original magnetic liquid is consumed, the locking screw on the shell is taken out, the magnetic liquid is injected into the opened magnetic liquid supplement injection channel through the syringe, under the action of the magnetic field, the injected magnetic liquid re-forms the magnetic liquid seal, the complexity of the maintenance operation is reduced, and the pressure resistance of the device is ensured.

The utility model discloses an environment-friendly treatment device for waste incineration slag, which relates to the field of slag treatment and comprises a shell, the shell comprises a shell body, a magnetic attraction separation mechanism is arranged in the shell body, an eddy current separation mechanism is arranged in front of the magnetic attraction separation mechanism and comprises a rotating shaft, and a separation conveying belt is sleeved on the rotating shaft. A cavity is formed in the rotating shaft, an alternating magnetic shaft is arranged in the cavity, a plurality of permanent magnets with opposite polarities are fixed on the alternating magnetic shaft, and a partition plate is arranged in front of the fifth rotating shaft. The device has the beneficial effects that the eddy current separation mechanism is arranged, an alternating magnetic field generated by rotation of an alternating magnetic shaft is utilized, induced eddy current is generated in non-magnetic metal, then thrust is generated on the non-magnetic metal so that the non-magnetic metal can be separated from slag, and the magnetic separation mechanism separates magnetic metal in the slag in advance; and through cooperation of the magnetic separation mechanism and the eddy current separation mechanism, all metal in the slag can be separated out.

The invention discloses a quantitative characterization method for a magnetic axis offset effect of a magnetic axis offset type permanent magnet synchronous motor. The quantitative characterization method comprises the following steps: judging a magnetic axis offset type of the magnetic axis offset type permanent magnet synchronous motor; calculating a permanent magnet axis deviation angle and a permanent magnet torque based on the permanent magnet axis deviation according to a dq axis permanent magnet flux linkage obtained under the reference dq coordinate system; calculating a motor inductance matrix expression when the reference coordinate system rotates and deviates from the initial position by a set angle based on reluctance magnetic axis deviation; when the reference dq coordinate system is aligned with the reluctance magnetic axis, the mutual inductance of the dq axis is 0, the deviation angle of the reluctance magnetic axis is obtained through calculation, and the reluctance torque is obtained through calculation; and comprehensively considering the offset effect of the permanent magnet magnetic axis and the reluctance magnetic axis, and calculating to obtain the torque characteristic offset condition of the motor. Based on the influence of the magnetic axis offset effect on the permanent magnet flux linkage and inductance parameter characteristics of the motor, the magnetic axis offset effect is comprehensively revealed, and a theoretical basis is provided for establishing a mathematical model of the magnetic axis offset type permanent magnet synchronous motor and comprehensively revealing a torque lifting mechanism.

The utility model discloses a kind of magnetic shaft structures that can sound, including base, the upper cover being set on base, the guide core being movably set between base and upper cover, and the elastic member being sleeved between base and guide core, further including the magnet being sleeved on the bottom of the guide core, the lower end of guide core is formed with magnetic installation groove, the middle part of magnetic installation groove is formed with the sound column extending towards base direction;Magnet is overall circular ring column shape, it is embedded in the magnetic installation groove, wherein hollow part is sleeved on the periphery of sound column;The lower end of sound column penetrates through magnet lower end surface and continues to extend downward, and its downward extending portion is impacted base to sound under the action of external force.The utility model provides a kind of magnetic shaft structures that can sound, guide core is impacted on base when being pressed and moved downward, magnet is sleeved on guide core, so as to realize good sound effect in the case where magnet is not damaged and the transmission accuracy is guaranteed, improve the use experience of user.

The utility model provides a magnetic axis key capable of improving pressing hand feeling and a keyboard. The magnetic shaft key comprises a non-magnetic key cap, a key shaft, a magnetic sensing module, a movable magnet and a static magnet, and the magnetizing directions of the movable magnet and the static magnet are opposite and are both pressing directions of the key. The soft magnetic material sheet is arranged on the upper end face of the key cap, nonlinear attraction change between the movable magnet and the soft magnetic material sheet during pressing is utilized to counteract part of nonlinear repulsive force increase between the movable magnet and the static magnet, and meanwhile, the key automatically returns to the initial state after being pressed. The magnetic axis key provided by the utility model effectively eliminates the discontinuous feeling during pressing, and improves the pressing hand feeling of the key.

The wake-up device comprises a keyboard body, a circuit board, an elastic piece and an induction wake-up piece, the keyboard body comprises a key cap, a key shaft and a magnetic piece, the circuit board is provided with a first magnetic field intensity detection piece and a control chip, the keyboard body is connected with one side of the circuit board through the elastic piece, and the induction wake-up piece is arranged on the other side of the circuit board. The magnetic part is close to or far away from the first magnetic field intensity detection part, the first magnetic field intensity detection part generates different detection values according to the magnetic field intensity, and the control chip obtains input data of the keyboard according to the detection values; and the induction awakening piece is electrically connected with the control chip, adopts an acceleration detection piece or a second magnetic field intensity detection piece, and is used for awakening the control chip in a standby state. The induction awakening piece is adopted to detect the use state of the keyboard and awaken the control chip, the situation that the standby power consumption is too large due to the fact that the first magnetic field intensity detection piece needs to output a detection value in real time for the control chip to obtain the input state of the keyboard is avoided, and the standby power consumption is effectively reduced.

A motive power transmission device (1) includes an outer magnet shaft (150), a pole piece shaft (160), a selector (170) that selectively stops rotation of one of the outer magnet shaft and the pole piece shaft on the basis of a command, and a magnetic sensor (190) that is disposed in a position affected by a magnetic flux of one or both of a plurality of outer magnetic poles (152A, 152B) and a plurality of magnetic body parts (162) and that detects a magnetic flux density change and the magnitude thereof associated with the rotation of one of the outer magnet shaft and the pole piece shaft.

The invention discloses a magnetic shaft pump which comprises a main body, the main body is sleeved with an electrified coil, a coupling magnet matched with the electrified coil is arranged in the main body, diaphragms capable of being pushed through the coupling magnet are arranged at the two ends of the main body respectively, and connecting shells are further arranged on the outer sides of the diaphragms. The edge of one end of the main body is in sealed connection with the corresponding diaphragm and the corresponding connecting shell, a cavity is formed between the corresponding connecting shell and the diaphragm, and a magnetic field is generated through the electrified coil; the movement direction of the coupling magnet changes along with the change of the magnetic field direction of the electrified coil; the kinetic energy generated by the movement of the coupling magnet can be used for generating pressure through the diaphragm compression cavity; due to the fact that a motor of a traditional pump is omitted, the size can be made smaller, and the pump can be applied to small-sized products in the fields of medical treatment, household appliances and the like.

The invention relates to the field of tools for machining, and discloses a tool for machining a turbine disc and a preparation method of the tool for machining the turbine disc, the magnetic axis complexity of a hard alloy blank is reduced by adjusting WC-Co hard alloy element components of a base material, and the magnetic axis orientation distribution in the hard alloy blank is changed by using magnetic lines of force in an external polar region, so that the machining precision of the turbine disc is improved. The hard alloy blank is soft and smooth and shows single-orientation distribution of magnetic lines; a drift diffusion mode is combined, low-pressure non-equilibrium plasma nitrogen migration is guided, a wear-resistant phase with higher hardness is formed on the surface of the cutter without affecting the geometrical shape of the cutter, and therefore nitrogen ion directional guiding is achieved, and a nitrogen element gradient distribution structure is achieved on the surface of the hard alloy cutter; therefore, the surface hardness and the high-temperature resistance of the hard alloy cutter material are improved, and adhesive abrasion and groove abrasion generated in the machining process of the turbine disc alloy material by the hard alloy cutter are reduced.

The present invention discloses an integration and calibration method of a geomagnetic vector measuring device for exploration, and belongs to the field of geomagnetic vector measurement and positioning. The integration and calibration method of a geomagnetic vector measuring device for exploration of the present invention comprises the following steps: S1: designing the main body of the magnetic vector measuring equipment as a cross-shaped frame structure; S2: magnetic probes are arranged at both the upper and lower ends of the cross-shaped frame; S3: detecting the rotation relationship between the three-axis magnetic coordinates of the magnetic probe and the three-axis coordinates of the attitude meter; S4: making correction calculations for the various parameters detected. The present invention solves the problem that the existing technology rigidly installs the magnetometer and attitude meter on the aircraft through hard brackets and other devices during use, and the measurement accuracy is not high due to the lack of a matching perfect calibration solution. The present invention greatly improves the accuracy of geomagnetic vector measurement, and can not only carry out aviation magnetic vector and magnetic vector vertical gradient measurement, but also can be used for ground geomagnetic vector measurement, and has higher practicality.

There is provided an inductive heating device (100) for aerosol-generation. The inductive heating device (100) comprises a heater assembly defining a cavity (68) having an internal surface for receiving at least a portion of an aerosol-forming insert (300) comprising an aerosol-forming substrate and a susceptor. The heater assembly comprising an induction coil (16) having a magnetic axis and arranged to surround at least a portion of the cavity (68); wherein a wire material (6) forming the induction coil (16) has a cross-section comprising a main portion, the main portion having a longitudinal extension in a direction of the magnetic axis and a lateral extension perpendicular to the magnetic axis, which longitudinal extension is longer than the lateral extension of the main portion, wherein the wire material (6) comprises an electrically conductive coating (8).

The application discloses a rigid support electric turning method for vertical shaft semi-umbrella type hydroelectric generator set, which comprises the following steps: turning preparation, erecting a dial gauge on an operating oil pipe, checking the gap between a rotating part and a fixed part, and turning, wherein the turning method is as follows: constant direct current is supplied to a generator rotor winding, and the stator is sequentially and cyclically supplied with current in the order of A, B and C three phases in an intermittent mode; when the electromagnetic torque generated by the magnetic field is greater than the friction torque of the rotor, the rotor rotates by one electrical angle; until the magnetic axes of the stator and the rotor coincide, the rotor stops rotating, that is, a measuring point is reached; after reading is completed, the current is supplied to another phase of the stator, so that the rotor rotates by one electrical angle again; the above process is repeated until reading of all measuring points is completed. The application only turns the upper guide bearing tile during turning, optimizes the turning process, adopts electric turning driving, reduces operation intensity, and improves the turning efficiency.

The utility model provides a kind of magnetic shaft button, including key shaft, metal magnetic conducting sheet, button shell and two axial magnetization identical magnets.The metal magnetic conducting sheet is fixedly arranged in the upper end of button shell, and the middle hole is opened in it.The one end of the key shaft is set in button shell through the middle hole of the metal magnetic conducting sheet, and the two magnets are symmetrically installed on the pair of outer side surfaces of the shaft body of the key shaft below the metal magnetic conducting sheet.The magnetic shaft button is recovered to the state before being pressed when it is not pressed, by the magnetic force action between the metal magnetic conducting sheet and the two magnets.The magnetic shaft button provided by the utility model realizes reverse linear feedback pressing feeling and pressing recovery mechanism based on the magnetic force action between the metal magnetic conducting sheet and moving magnet, and provides a kind of "from heavy to light, down-dive" light unique feeling with simple structure.

The invention discloses a magnetofluid sealing structure with a conical sealing gap. The magnetofluid sealing structure comprises a conical shaft sleeve, a bearing assembly, a magnetofluid sealing assembly and a sealing cover assembly. And the size of the sealing gap can be flexibly adjusted by axially moving the magnetic conductive shaft sleeve, so that the sealing capability in practical application is convenient to adjust. Due to the design of the inclined sealing gap, the magnetic fluid is more uniformly distributed in the gap, the sealing pressure can be effectively improved, and leakage is prevented. A small hole is formed in the middle of each sealing magnetic pole, the pressure nitrogen is introduced, the pressure of the introduced nitrogen is gradually reduced from front to back, and the magnetic fluid sealing capacity of each magnetic pole is improved through introduction of the pressure nitrogen. According to the magnetofluid sealing structure with the conical sealing gap, the existing defects are overcome, the sealing gap is adjustable, and the sealing performance is effectively improved.

The utility model discloses a keyboard key magnetic shaft, and aims to provide a keyboard key magnetic shaft which is simple in structure, obvious in key pressing feedback, capable of enhancing a magnetic field of a Hall IC (Integrated Circuit) through ferrite when the magnetic shaft moves to enable the Hall IC to control a trigger stroke more easily, and higher in magnetic shaft sensitivity. The key comprises a key base and a shaft body, the key base comprises a base upper cover and a base lower cover, the shaft body comprises a shaft center, a magnet and a spring, a shaft center installation groove is formed in the middle of the base lower cover, the shaft center is matched with the shaft center installation groove in a limiting mode, the spring is arranged between the shaft center and the base lower cover, and the magnet is arranged in the shaft center installation groove. A ferrite and a Hall IC are arranged at the lower end of the base lower cover, the magnet is arranged on one side of the axis, and the axis drives the magnet to be matched with the ferrite to enable the Hall IC to achieve signal conversion. The keyboard shaft body is applied to the technical field of keyboard shaft bodies.